Constructor and Destructor Behavior in Inheritance

  • Constructor Execution: When an object of the derived class is created, the constructor of the base class executes first, followed by the constructor of the derived class.
  • Destructor Execution: The destructor of the derived class is executed first, followed by the base class destructor, in reverse order of construction.
  • Chaining Constructors: Constructors can be passed values to the base class using initializer lists.

 

Example:

class Base {

public:

    Base() { cout << “Base Constructor”; }

    ~Base() { cout << “Base Destructor”; }

};

class Derived : public Base {

public:

    Derived() { cout << “Derived Constructor”; }

    ~Derived() { cout << “Derived Destructor”; }

};

 

12.5 Function Overriding and Virtual Functions

  • Function Overriding allows a derived class to provide a specific implementation of a function that is already defined in its base class.
  • To ensure correct runtime behavior, use virtual functions. This supports runtime polymorphism.

Example:

class Base {

public:

    virtual void show() { cout << “Base show”; }

};

class Derived : public Base {

public:

    void show() override { cout << “Derived show”; }

};

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